A microscopic model for spiral ordering along (110) on the MnSi lattice

Details A microscopic model for spiral ordering along (110) on the MnSi lattice A microscopic model for spiral ordering along (110) on the MnSi lattice

2006-08-02

arxiv.org/abs/cond-mat/0608065v1

Phys. Rev. B 75, 064430 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.75.064430

We study an extended Heisenberg model on the MnSi lattice. In the cubic B20 crystal structure of MnSi, Mn atoms form lattices of of corner-shared equilateral triangles. We find an ubiquitous spiral ordering along (110) for J1 <0, and J2=J3 >0, where J1, J2, and J3 are 1st, 2nd and 3rd nearest neighbor Heisenberg interactions, respectively. While the ordering direction of (110) is reasonably robust to the presence of the Dzyaloshinskii-Moriya interaction, it can be shifted to the (111) direction with the introduction of a magnetic anisotropy term for small J2/|J1|. We discuss the possible relevance of these results to the partially ordered state recently reported in MnSi.

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